windows server upgrades

currently have a 2003 standard server o.s. running 14 users peer to peer. All pointing to a program with data on this server. Not using server as a domain.standard does not have that option..

1. what can/should i replace this with ? 2012 esentials?

2. Does 2012 esentials have domain option? if not then what product should i be looking at?
3. is there a newer server o.s. than 2012?
4. xp limited amount of users that could connect to say one box. the limit was either 5 or 10 --I can't remember. Is there a limit on windows 7 pro or ultimate
if i were to put that on the server and run peer to peer with the 14 users connecting to it?

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